- ADW: Herring Gull (Larus argentatus)
- Gives photographs, audio, distribution, habitat types, characteristics, taxonomy, life cycle, longevity, home range, primary diet, known predators, and adaptations.
- ARKive.org: Herring Gull (Larus argentatus argenteus)
- Examines classification, size, range, habitat, diet and feeding habits, appearance, status, threats, and conservation. Offers images, videos, and related species.
- Black-billed Gull (Larus bulleri)
- Information covers physical characteristics, conservation and status, threats, locations, biomes, diet, nesting, images, and videos. From ARKive.org.
- Common Gull (Larus canus)
- Facts from ARKive.org include size, status, classification, distribution, habitat, seasonal diet, nesting, photographs, and links to additional information.
- Heermann's Gull (Larus heermanni)
- Photographs, videos, and related species combine with classification, characteristics, status, threats, conservation, locations, and feeding information.
- Lava Gull (Larus fuliginosus)
- Gives classification, pictures, video, current status, threats, conservation efforts, diet, nesting, foraging habitats, locations, and coloring.
- NatureWorks: Ring-billed Gull (Larus delawarensis)
- From New Hampshire Public TV, reports classification, characteristics, diet and feeding behavior, seasonal range and habitat, reproduction, and nesting sites.
- Project Puffin: Laughing Gulls (Larus atricilla)
- Brief article from Audubon.org offers audio file, images, noises, local population, source of name, distribution, and behavior.
- SeaWorld Animal Bytes: Gulls
- Details include scientific classification, general description and size, diet, incubation range, species' distribution and habitat, status, and protection.
- Virtual Zoo: Black-headed Gull (Larus ridibundus)
- Photographs and distribution map accompany brief information on local language names, extensive range, status, and population estimates.
- WAZA Virtual Zoo: Grey Gull (Larus modestus)
- Brief information includes classification, other names, range, status, populations, photographs, and distribution map.
- WhoZoo: Laughing Gull
- Gives scientific name, wild and zoo diets, size and appearance, range, habitat, colonies, feeding behavior, adaptations, and observations at the zoo.
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